公开(公告)号：US20230156234A1

公开(公告)日：2023-05-18

申请号：US17726713

申请日：2022-04-22

Applicant: MEDIATEK INC.

Inventor： Shih-Chun CHIU ,  Chih-Wei HSU ,  Ching-Yeh CHEN ,  Chun-Chia CHEN ,  Tzu-Der CHUANG ,  Yu-Wen HUANG

IPC: H04N19/82 ,  H04N19/117 ,  H04N19/147 ,  H04N19/186 ,  H04N19/124

CPC classification number: H04N19/82 ,  H04N19/117 ,  H04N19/124 ,  H04N19/147 ,  H04N19/186

Abstract: Video encoding methods and apparatuses include receiving reconstructed video samples, determining an initial clipping setting for ALF coefficients, deriving clipping setting candidates from the initial clipping setting. ALF coefficients for the initial clipping setting and the clipping setting candidates are derived by solving inverse matrices, where partial intermediate results of solving ALF coefficients are shared by two or more clipping settings. A distortion value corresponds to the derived ALF coefficients for each clipping setting is computed, and final clipping indices for final ALF coefficients are determined according to the distortion values. ALF filtering is applied to the reconstructed video samples based on the final ALF coefficients and the final clipping indices.

公开(公告)号：US20220232205A1

公开(公告)日：2022-07-21

申请号：US17609702

申请日：2020-05-07

Applicant: MEDIATEK INC.

Inventor： Man-Shu CHIANG ,  Chih-Wei HSU ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Yu-Wen HUANG ,  Shih-Ta HSIANG

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/176

Abstract: Method and apparatus of video coding are disclosed. According to one method, in the decoder side, a predefined Intra mode is assigned to a neighboring block adjacent to the current luma block when the neighboring block satisfies one or more conditions. An MPM (Most Probable Mode) list is derived based on information comprising at least one of neighboring Intra modes. A current Intra mode is derived utilizing the MPM list. The current luma block is decoded according to the current Intra mode According to another method, a predefined Intra mode is assigned to a neighboring block adjacent to the current luma block if the neighboring block is coded in BDPCM (Block-based Delta Pulse Code Modulation) mode, where the predefined Intra mode is set to horizontal mode or vertical mode depending on prediction direction used by the BDPCM mode.

公开(公告)号：US20220224891A1

公开(公告)日：2022-07-14

申请号：US17609707

申请日：2020-05-06

Applicant: MEDIATEK INC.

Inventor： Man-Shu CHIANG ,  Chih-Wei HSU ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Yu-Wen HUANG ,  Shih-Ta HSIANG

IPC: H04N19/11 ,  H04N19/159 ,  H04N19/186 ,  H04N19/176

Abstract: A method and apparatus of prediction for video coding are disclosed. According to one method, a luma Intra prediction mode is determined for a corresponding luma block collocated with the current chroma block, where a predefined mode is assigned to the luma Intra prediction mode when the corresponding luma block collocated with the current chroma block satisfies one or more conditions. A chroma Intra prediction mode is determined for the current chroma block according to the luma Intra prediction mode. The current chroma block is then encoded or decoded according to the chroma Intra prediction mode. According to another method, a predefined mode is assigned to Intra prediction mode for the current block when the current block satisfies one or more conditions. The current block is then encoded or decoded according to the Intra prediction mode.

公开(公告)号：US20220078418A1

公开(公告)日：2022-03-10

申请号：US17526678

申请日：2021-11-15

Applicant: MEDIATEK INC.

Inventor： Yu-Wen HUANG ,  Yu-Chen SUN ,  Tzu-Der CHUANG ,  Jian-Liang LIN ,  Ching-Yeh CHEN

IPC: H04N19/117 ,  H04N19/82 ,  G06T5/00 ,  H04N19/86 ,  H04N19/182 ,  H04N19/50 ,  G06N3/04

Abstract: A method and apparatus of video coding incorporating Deep Neural Network are disclosed. A target signal is processed using DNN (Deep Neural Network), where the target signal provided to DNN input corresponds to the reconstructed residual, output from the prediction process, the reconstruction process, one or more filtering processes, or a combination of them. The output data from DNN output is provided for the encoding process or the decoding process. The DNN can be used to restore pixel values of the target signal or to predict a sign of one or more residual pixels between the target signal and an original signal. An absolute value of one or more residual pixels can be signalled in the video bitstream and used with the sign to reduce residual error of the target signal.

公开(公告)号：US20210344934A1

公开(公告)日：2021-11-04

申请号：US17270610

申请日：2019-08-30

Applicant: MEDIATEK INC.

Inventor： Chia-Ming TSAI ,  Chih-Wei HSU ,  Ching-Yeh CHEN ,  Tzu-Der CHUANG ,  Yu-Wen HUANG

IPC: H04N19/176 ,  H04N19/117 ,  H04N19/513 ,  H04N19/159 ,  H04N19/132 ,  H04N19/184

Abstract: Method and apparatus for constrained de-blocking filter are disclosed. According to one method, if a CU is partitioned into multiple sub-CUs, the de-blocking process is also applied to the sub-block boundaries inside the current filtered-reconstructed block. According to another method, if first reference samples used for the de-blocking process of a first boundary are to be modified by the de-blocking process of a second boundary, the first reference samples are replaced by padding samples that are not to be modified by the de-blocking process of the second boundary. According to yet another method, the de-blocking process is applied to a reconstructed block corresponding to a current block to result in a current filtered-reconstructed block regardless whether a boundary of the current block corresponds to an 8×8 sample grid boundaries.

公开(公告)号：US20210266566A1

公开(公告)日：2021-08-26

申请号：US17261344

申请日：2019-08-15

Applicant: MEDIATEK INC.

Inventor： Chun-Chia CHEN ,  Chih-Wei HSU ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Yu-Wen HUANG

IPC: H04N19/159 ,  H04N19/105 ,  H04N19/137 ,  H04N19/119 ,  H04N19/96 ,  H04N19/46 ,  H04N19/176

Abstract: A method and apparatus of video coding are disclosed. According to one method, if a block size of the current block is smaller than a threshold, a candidate list is constructed without at least one candidate derived from neighbouring blocks. According to another method, a current area is partitioned into multiple leaf blocks using QTBTTT (Quadtree, Binary Tree and Ternary Tree) structure and the QTBTTT structure corresponding to the current area comprises a target root node with multiple target leaf nodes under the target root node and each target leaf node is associated with one target leaf block. If a reference block for a current target leaf block is inside a shared boundary or a root block corresponding to the target root node, a target candidate associated with the reference block is excluded from a common candidate list or a modified target candidate is included in the common candidate list.

公开(公告)号：US20210176485A1

公开(公告)日：2021-06-10

申请号：US16613674

申请日：2018-05-17

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Yu-Wen HUANG ,  Chih-Wei HSU

IPC: H04N19/52 ,  H04N19/159 ,  H04N19/189 ,  H04N19/176

Abstract: Method and apparatus of Inter prediction for video coding are disclosed. When a sub-block motion compensation coding tool is selected for the current block, the method generates sub-block MVs (motion vectors) associated with multiple sub-blocks, which are included or contained in the current block, according to the sub-block motion compensation coding tool, constrains the sub-block MVs within a range to form constrained sub-block MVs, and applies motion compensation to the current block using the constrained sub-block MVs or applies motion compensation to the current block using one sub-block MV within the range around the primary MV in a second list if a corresponding sub-block MV in a first list is outside the range. In another method, motion compensation is applied to the current block only using reference pixels of reference sub-blocks within a primary reference block.

公开(公告)号：US20200296365A1

公开(公告)日：2020-09-17

申请号：US16817707

申请日：2020-03-13

Applicant: MEDIATEK INC.

Inventor： Ching-Yeh CHEN ,  Tzu-Der CHUANG ,  Yu-Wen HUANG

IPC: H04N19/117 ,  H04N19/182 ,  H04N19/96

Abstract: A method and apparatus for Adaptive Loop Filter (ALF) processing of reconstructed video are disclosed. According to this method, multiple indicators are signaled in slice at an encoder side or parsed at a decoder side, where the multiple indicators are Adaptive Parameter Set (APS) indices associated with temporal ALF filter sets for the ALF processing. A current indicator is determined from the multiple indicators, where the current indicator is used to select a current ALF filter set. Filtered-reconstructed pixels are derived for the current block by applying the current ALF filter to the current block. In another method, if the ALF processing applied at a target sample requires an outside sample on other side of a target virtual boundary from the target sample, the outside sample is replaced by a padded sample.

公开(公告)号：US20190387251A1

公开(公告)日：2019-12-19

申请号：US16444078

申请日：2019-06-18

Applicant: MEDIATEK INC.

Inventor： Zhi-Yi LIN ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Chih-Wei HSU ,  Chen-Yen LAI ,  Yu-Wen HUANG

IPC: H04N19/583 ,  H04N19/159 ,  H04N19/132 ,  H04N19/105 ,  H04N19/43 ,  H04N19/176 ,  H04N19/186

Abstract: Exemplary video processing methods and apparatuses for coding a current block determine a number of OBMC blending lines for a boundary between a current block and a neighboring block according to motion information, a location of the current block, or a coding mode of the current block. OBMC is applied to the current block by blending an original predictor of the current block with an OBMC predictor for the number of OBMC blending lines. Some other exemplary video processing methods and apparatuses for coding a current block extend reference samples fetched from a buffer by a padding method to generate padded sample, and OBMC is applied to the current block or a neighboring block by blending an original predictor with an OBMC predictor generated from the extended reference samples.

公开(公告)号：US20190289320A1

公开(公告)日：2019-09-19

申请号：US16431062

申请日：2019-06-04

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Chia-Yun CHENG ,  Han-Liang CHOU ,  Ching-Yeh CHEN ,  Yu-Chen SUN ,  Yu-Wen HUANG

IPC: H04N19/563 ,  H04N19/70 ,  H04N19/513 ,  H04N19/593

Abstract: In order to overcome the issue caused by a decoded block vector (BV) pointing to a reference block overlapping with an unavailable area, various methods are disclosed. According to one method, if the reference block overlaps with an unavailable area, the reference pixels in the unavailable area are generated for IntraBC prediction of the current block by padding from neighbouring available pixels. The padding can be done in the horizontal direction and then the vertical direction. The padding may also done in the vertical direction first and then horizontal direction. In another method, if the reference block overlaps with an unavailable area, the reference pixels in the unavailable area are generated for IntraBC prediction of the current block by using previous decoded pixels in the unavailable area. A pre-defined value may also be used for the unavailable area.